Enabling selection on enter, not movement.

[dhoehna]

Summary of the pull request

Previous implementation used an ItemsView to get an accented border around an environment. A result is that moving between the environments with the arrows also selected the environment.

This change uses a list view to

1. Get the blue pill
2. Enables selection when the enter key is pressed and only when the enter key is pressed.

References and relevant issues

https://task.ms/50553395

Detailed description of the pull request / Additional comments

Validation steps performed

PR checklist

• Closes #xxx
• Tests added/passed
• Documentation updated

Movie!

[bbonaby]

For this one, if we're moving towards using a listview I think we should do 2 things:

1. Make a bug in the Win UI 3 repo to see if this is a bug in the items view control or if it'd be considered a feature request (which would probably mean it'd be on the backlog for a long time).
2. We'd need to update the padding and margins for the listview, because based on the video it looks a bit off when an item is selected. I think Christian would end up filling a bug for that if we leave it this way.

[dhoehna]

Changed to Draft because the Items aren't aligned with the header. This is because the ListView adds left-padding to make space for the pill.

[dhoehna]

Waiting for Design to look over it.

[dhoehna]

@bbonaby

see if this is a bug
What bug? ItemsView did not have a bug.

[bbonaby]

@bbonaby

see if this is a bug
What bug? ItemsView did not have a bug.

Oh I meant as in, maybe the ItemsView control isn't suppose to auto select the list item on key up/down but instead act like the listview and not auto select on key up/down.